function sendAjaxRequest(pars, callBack){
        //window.parent.contentFrame.setStatus("wait", "Communicating with the server. Please wait..." );
        var url = pars.url;
        pars.txn = String(new Date().getTime());
        var parms = $H(pars).toQueryString();
        //alert( parms );
        //var callBack = callBack || ajaxCallback;
        var myAjax = new Ajax.Request(
                url, 
                {
                        method: 'get', 
                        parameters: parms, 
                        onComplete: callBack,
                        onFailure: function(transport){alert( transport.responseText);}
                });
}